EP1079536A2 - Appareil pour communication filaire à spectre etalé et procédé de communication - Google Patents

Appareil pour communication filaire à spectre etalé et procédé de communication Download PDF

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Publication number
EP1079536A2
EP1079536A2 EP20000107077 EP00107077A EP1079536A2 EP 1079536 A2 EP1079536 A2 EP 1079536A2 EP 20000107077 EP20000107077 EP 20000107077 EP 00107077 A EP00107077 A EP 00107077A EP 1079536 A2 EP1079536 A2 EP 1079536A2
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EP
European Patent Office
Prior art keywords
signal
spread
signals
spreading
transmission line
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EP20000107077
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German (de)
English (en)
Inventor
Tadashi Suetsugu
Mitsusato Kawashima
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Ibiden Industries Co Ltd
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Ibiden Industries Co Ltd
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Publication of EP1079536A2 publication Critical patent/EP1079536A2/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation

Definitions

  • the present invention relates to a wired spread spectrum communication apparatus for transmitting an information signal by using a transmission line and a communication method.
  • the spread spectrum method employed in radio communication is, in general, structured as follows: an information signal is converted into a transmission signal having a radio frequency (for example, a 2.4 GHz band) by, as a first step, converting the information signal to have a narrow-band waveform by performing modulation (primary modulation ) using PSK or the like or multi-valued modulation using CDMA or QPSK. Then, diffusion modulation (secondary modulation) is performed to spread the spectrum.
  • the receiver portion (see Fig. 7 (B) has a structure to inversely spread the supplied signal having the spread spectrum to restore the signal to an inversely-spread signal (a primarily modulated signal). Then, the receiver portion demodulates the information signal by a heterodyne wave-detector or the like thereof.
  • the spread spectrum communication method adapted to the wired communication a necessity arises, however, for the transmission side to have a primary modulation circuit for modulating the information signal. Also the receiving side must have a demodulating circuit for demodulating the signal, which has been inversely spread, into the information signal. Therefore, there arises a problem in that the structures of circuits of the communication apparatus cannot be simplified.
  • an object of the present invention is to provide a wired spread spectrum communication apparatus which is capable of realizing a spread spectrum communication by using a relatively simple structure and a communication method.
  • Another object of the present invention is to provide a wired spread spectrum communication apparatus which is capable of realizing a CDMA which is able to quickly capture synchronization.
  • a wired spread spectrum communication apparatus for transmitting information signals by using a transmission line, said wired spread spectrum communication apparatus comprising:
  • a wired spread spectrum communication method of transmitting information signals by using a transmission line comprising the steps of:
  • a wired spread spectrum communication method of transmitting information signals by using a transmission line comprising the steps of:
  • a wired spread spectrum communication apparatus for transmitting information signals of a plurality of channels by code-division multiple connection through a transmission line, said wired spread spectrum communication apparatus comprising:
  • a wired spread spectrum communication apparatus for transmitting information signals of a plurality of channels by code-division multiple connection through a transmission line, said wired spread spectrum communication apparatus comprising:
  • a wired spread spectrum communication method of transmitting information signals of a plurality of channels by code-division multiple connection through a transmission line comprising the steps of:
  • the aspect of the invention incorporates the spreading-code generator, the multiplier and the transmission means.
  • the information signals are multiplied with predetermined spreading codes so as to be converted into spread signals which are transmitted to the transmission line.
  • the information signals can directly be spread and transmitted.
  • the aspect of the invention incorporates the spreading-code generator, the multiplier, the integrator and the comparator. Therefore, the signals received from the transmission line are multiplied with the inversely-spreading codes so as to be formed into the inversely-spread signals. Then, at least one period of the bit region of each bit of the information signal is integrated. Then, whether or not the integrated value is larger than the predetermined value, is determined by making a comparison. Thus, decoding to the information signals is performed. At least one period of the inversely-spread signal is integrated for each bit of the information signal so as to extract the information signals from the inversely-spread signals.
  • the aspect of the invention has the steps of multiplying a signal received from the transmission line with a predetermined spreading code to generate an inversely-spread signal; integrating the inversely-spread signal in a quantity of at least one period of the information signal constituted by one bit of the information signal; and making a determination whether or not the integrated value is larger than a predetermined value so that the information signal for each channel is decoded. That is, the generated inversely-spread signal is integrated in a quantity of at least one period constituted by one bit of the information signal to extract the information signal from the inversely-spread signal.
  • the aspect of the invention incorporates the synchronizing-signal generator and the transmission means.
  • the synchronized signal synchronized with any one of the information signal, the spreading code and the spread signal is transmitted to the transmission line together with the spread signal.
  • the synchronized signal which is effective for the receiving side to reproduce the signal is transmitted to the transmission line together with the spread signal. Therefore, the synchronization capturing method using detection of the correlation value is not employed by the receiving side to extract the synchronized signal from the signal received from the transmission line.
  • the aspect of the invention has the step of transmitting the synchronized signal synchronized with any one of the information signal, the spreading code and the spread signal to the transmission line together with the spread signal. That is, also the synchronized signal which is effective for the receiving side to reproduce the signal is transmitted to the transmission line together with the spread signal. Therefore, the synchronization capturing method using detection of the correlation value is not employed by the receiving side to extract the synchronized signal from the signal received from the transmission line.
  • the aspect of the invention incorporates the spreading-code generator, the multiplier, the integrator and the comparator.
  • the signal for each channel received from the transmission line is multiplied with the inversely-spreading code so as to be formed into the inversely-spread signal.
  • the inversely-spread signal is integrated in a quantity of at least one period constituted by one bit of the information signal.
  • whether or not the integrated value is larger than a predetermined value is determined by making a comparison.
  • the inversely-spread signal is integrated in a quantity of at least one period constituted by one bit of the information signal to extract the information signals from the inversely-spread signals.
  • the aspect of the invention has the step of multiplying each information signal for each of the plural channels with a corresponding spreading code to generate a spread signal. Then, the spread signals are added and transmitted to the transmission line. That is, the information signals of a plurality of the channels are directly spread and added so as to be transmitted to the transmission line.
  • the aspect of the invention incorporates the synchronizing-signal generator and the transmission means. Therefore, the synchronized signal synchronized with any one of, the information signal, the spreading code and the spread signal is transmitted to the transmission line together with the spread signal. Also the synchronized signal which is effective for the receiving side to reproduce the signal is transmitted to the transmission line together with the spread signal.
  • the aspect of the invention has the step of transmitting the synchronized signal which is synchronized with any one of the information signal, the spreading code or the spread signal to the transmission line together with the spread signal. That is, also the synchronized signal which is effective for the receiving side to reproduce the signal is transmitted to the transmission line together with the spread signal.
  • the communication apparatus is a CDMA communication apparatus incorporating a transmission unit 20 and a receiving unit 50.
  • Fig. 1 shows the structure of the transmission unit 20 of the CDMA communication apparatus.
  • Fig. 5 shows the structure of the receiving unit 50. The blocks of transmission unit 20 and the receiving unit 50 are illustrated.
  • the main channel port 21 assigns the plural information signals D1 to Dn to input ports of the corresponding channels so as to enable the information signals D1 to Dn to be multiplied with the corresponding spreading codes SC1 to SCn.
  • the main channel port 21 is, for example, a terminal group.
  • the multiplier 28 multiplies the spreading code SCn supplied from the spreading-code generator 25 corresponding to the channel n and the information signal Dn of the channel n with each other.
  • spread signals SS2 and SSn are generated.
  • the spectrums of the information signals D1 to Dn of the channels 1 to n are spread with the individual spreading codes SC1 to SCn.
  • the information signals D1 to Dn can be divided into signals which do not easily interfere with one another.
  • the adder 29 is structured to be capable of adding the spread signals SS1 to SSn of the corresponding channels 1 to n so as to synthesize the transmission signal. That is, all of the spread signals SS1 to SSn having the spectrums spread by the spreading codes SC1 to SCn are added so that a stepped signal waveform is generated.
  • the foregoing signal is, as a transmission output, transmitted to the electric line which is a transmission line (not shown).
  • the transmission signal which is a digital signal, can directly be transmitted to the electric line which is a transmission line (not shown). That is, the frequency band of the spreading code can directly be used as the transmission frequency band of the transmission signal.
  • a buffer amplifier or the like may be disposed in the rear of the adder 29, that is, a position between the adder 29 and the electric line which is a transmission line.
  • the marking-signal generator 31 is structured to be capable of generating a synchronizing signal which is generated at a predetermined period (frequency example, a period which synchronizes the frame of the information signal).
  • a marking signal MK of the marking-signal generator 31 is expressed by, for example, presence of a predetermined sine wave signal.
  • the marking signal MK is added to the spread signals SS1 to SSn by the adder 29 so that the marking signal MK constitutes a portion of the transmission signal. That is, the marking signal MK is constituted by performing ASK (Amplitude Shift Keying) modulation which is a kind of amplitude modulation.
  • ASK Amplitude Shift Keying
  • the marking signal MK is supplied to the spreading-code generators 23, 24 and 25 to generate the spreading code in synchronization with the marking signal MK.
  • the marking signal MK is generated in synchronization with the leading end or the trailing end of the frame of each of the information signals D1 to Dn.
  • start timing of the signal frame can be detected in accordance with start or end timing of the marking signal MK.
  • the receiving side performs synchronization in agreement with the marking signal MK, frames can easily be synchronized with each other. If the synchronization is lost owing to, for example, reduction in the signal level during communication, the synchronization can again be captured regardless of the position by using the marking signal MK after the signal level has been restored.
  • the period of synchronization of the marking signal is not limited to the frame of the information signal. The period may be made to be synchronized with the spreading code sequence or the spread signal.
  • the thus-synchronized transmission signal [0002000-2] is directly transmitted to the electric line which is the transmission line. Then, the transmission signal is received by the receiving unit 50 to be described later.
  • the receiving unit 50 comprises spreading-code generators 53, 54 and 55, multipliers 56, 57 and 58, integrators 61, 62 and 63, comparators 65, 66 and 67 and a marking signal extractor 71.
  • the receiving unit 50 has a function to inversely spread the received signal input from the electric line which is the transmission line. Then, the receiving unit 50 decodes information signals D1' to Dn' of the corresponding channels.
  • the spreading-code generator 53 is structured to be capable of generating the spreading code SC1 which is the same as that generated by the spreading-code generator 23 to inversely spread the information signal D1 corresponding to the channel 1.
  • the spreading code SC1 is generated in synchronization with the timing of the marking signal MK extracted by the marking signal extractor 71. Because of the same reason, the spreading-code generator 54 generates the spreading code SC2 corresponding to the channel 2, while the spreading-code generator 55 generates the spreading code SCn corresponding to the channel n. That is, the spreading-code generators are provided by the number corresponding to the number of the channels.
  • the multiplier 56 is structured to be capable of multiplying the spreading code SC1 supplied from the spreading-code generator 53 and the received signal with each other to generate an inversely-spread signal DSS1. That is, the spreading code SC1 supplied from the spreading-code generator 53 is the same code sequence as the spreading code SC1 obtained by spreading the spectrum of the information signal D1 of the channel 1. Therefore, the spreading code SC1 and the received signal are multiplied with each other so that inverse diffusion using the spreading code SC1 is performed. Thus, the received signal is converted into the inversely-spread signal DSS1. Similarly, the multiplier 57 multiplies the spreading code SC2 supplied from the spreading-code generator 54 corresponding to the channel 2 and the received signal with each other.
  • the multiplier 58 multiplies the spreading code SCn supplied from the spreading-code generator 55 corresponding to the channel n and the received signal with each other. Thus, inversely-spread signals DSS2 and DSSn are generated. As a result, the received signal is supplied into inversely-spread signals DSS1 to DSSn for the corresponding channels.
  • the integrator 61 is structured to be capable of integrating the inversely-spread signal DSS1 in a quality of one period of the information signal constituted by one bit of the information signal. Thus, an integrated value of each bit of the information signal can sequentially be obtained from the inversely-spread signal DSS1.
  • the information signal D1' of the channel 1 is decoded in accordance with the integrated value.
  • the integrator 62 integrates the inversely-spread signal DSS2 in a quantity of one period of the information signal constituted by one bit of the information signal.
  • the integrator 63 integrates the inversely-spread signal DSSn in a quantity of one period of the information signal constituted by one bit of the information signal.
  • the integrator 63 When also the integrator 63 is combined with the comparator 66 or the comparator 67, the information signals D2' and Dn' of the channel 2 and the channel n are decoded.
  • the region of one bit of the information signal is sectioned into n sections to perform the diffusion such that the spreading code is caused to correspond a plurality times n, each of the sections n constituting the one bit period of the information signal is integrated, that is, n periods constituting the one bit period is integrated.
  • code diffusion is furthermore finely performed, causing noise resistance which is the characteristic of the spread spectrum communication to furthermore be improved.
  • the comparator 65 is structured to be capable of producing an output of a H level or a L level in accordance with whether or not the input voltage is higher than reference voltage Vref1. That is, the comparator 65 makes a comparison of the integrated value which has been calculated by the integrator 61 and which is an analog signal to determine whether or not the integrated value is larger than a predetermined voltage. Then, the comparator 65 performs conversion to a digital signal "1" or "0", that is, decoding to the information signal D1'. Similarly, the comparator 66 determines whether or not the integrated value calculated by the integrator 62 is larger than the reference voltage Vref2. The comparator 67 determines whether or not the integrated value calculated by the integrator 63 is larger than the reference voltage Vrefn.
  • each of the comparators 66 and 67 output H level or L level.
  • the reference voltages Vref1, Vref2 and Vrefn of the comparator 65, 66 and 67 are set to be 0 V.
  • the foregoing comparators may be structured to determine whether or not the input voltages are smaller than the reference voltage, that is, the predetermined voltage so as to output the H level or the L level.
  • the marking signal extractor 71 is constituted by, for example, a filter which is capable of extracting the marking signal MK from the received signal.
  • the extracted marking signal MK is supplied to the spreading-code generators 53, 54 and 55.
  • the spreading-code generators 53, 54 and 55 are able to supply the spreading codes SC1 to SCn to the multipliers 56, 57 and 58 while frames are being synchronized with the marking signal MK. Therefore, the frames can easily be synchronized thanks to the marking signal MK. If the synchronization is temporarily lost in an initial state of the communication or during the communication, synchronization can quickly be captured as compared with capturing of the synchronization by detecting the correlation value.
  • a receiving unit 80 of a spread spectrum communication apparatus which is structured such that the number of the channel is one, that is, which is not multiplexed, can be constituted (see Fig. 6). Also in a case where the foregoing structure is employed, any demodulation circuit (for example, a heterodyne wave-detecting circuit) for demodulating the received signal after the inverse diffusion process is not required.
  • decoding of the one bit can be performed by using only the results of the comparisons between the integrated value calculated by the integrator 61 and the predetermined reference voltage, decoding can be performed if complete data in the one period of the bit region cannot be obtained. Therefore, the spread spectrum communication can be realized with a relatively simple structure. Since the Gaussian noise or the like is eliminated by smoothing the waveform by performing the integration, an influence of the signal noise is not easily exerted. The signal component of a required channel can efficiently be extracted.
  • the transmission unit 20 incorporates the spreading-code generators 23, 24 and 25, the multipliers 26, 27 and 28 and the adder 29.
  • the information signals D1 to Dn of the plural channels are multiplied with the corresponding predetermined "spreading codes SC1 to SCn so as to be converted into the spread signals SS1 to SSn.
  • the spread signals SS1 to SSn are added to one another so as to be synthesized as the transmission signal. Therefore, the information signals D1 to Dn of the plural channels can directly be spread to obtain the transmission signal. Therefore, the transmission signal, which is the digital signal, can directly be transmitted to the electric line which is the transmission line.
  • the modulation circuit for performing the multi-value modulation is not required. As a result, an effect can be obtained in that a wired CDMA can be realized with a relatively simple structure.
  • the transmission unit 20 incorporates the marking-signal generator 31 and the adder 29.
  • the marking signals synchronized with the information signals D1 to Dn, the spreading codes SC1 to SCn or the spread signals SS1 to SSn are added to the spread signals SS1 to SSn by the adder 29 so that results of the addition are transmitted to the electric line. Therefore, the receiving unit 50 does not employ the synchronization capturing method using detection of the correlation value.
  • the receiving unit 50 is able to extract the marking signal from the signal received from the electric line so that easy capturing of the synchronization in accordance with the timing of the marking signal transmitted at the predetermined period is permitted.
  • the synchronizing method with which the synchronization waveform is detected to synchronize the frames in the initial state and the edge of the received waveform is detected during the operation to synchronize the clocks which encounters the problems (a problem that the synchronization of the frames lost during the communication cannot be restored and a problem that synchronization of the clocks cannot be established because the edge of the received waveform frequently disappears owing to an adverse environment and the like).
  • the structure according to this embodiment is able to cope with the foregoing problems. As a result, an effect can be obtained in that the wired CDMA can be realized with a relatively simple structure.
  • the synchronization can be captured by the method with which the marking signal is extracted from the signal received from the electric line, an effect can be obtained in that a CDMA can be realized which is capable of quickly capturing the synchronization as compared with the synchronization capturing method using detection of the correlation value.
  • the wired CDMA can be realized to be adaptable to a packet communication system with which communication period of time per packet is considerably short.
  • the transmission unit 40 incorporates the spreading-code generator 23 and the multiplier 26.
  • the transmission signal which is a digital signal
  • the frequency band of the spreading code can directly be used as the transmission frequency band of the transmission signal.
  • a necessity for the transmission side to modulate information signals before the diffusion is performed can be eliminated as distinct from the CDMA adapted to the wireless communication.
  • the primary modulation circuit is not required.
  • an effect can be obtained in that the spread spectrum communication can be realized with a relatively simple structure.
  • the receiving unit 80 incorporates the spreading-code generator 53, the multiplier 56, the integrator 61 and the comparator 65.
  • the demodulation circuit for example, a heterodyne wave-detecting circuit
  • decoding of the one bit can be performed by using only the results of the comparisons between the integrated value obtained by the integrator 61 and the predetermined voltage, decoding can be performed if complete data in the one period of the bit region cannot be obtained. Therefore, wired spread spectrum communication can be realized with a relatively simple structure. Since Gaussian noise or the like is eliminated by smoothing the waveform by performing the integration, an influence of the signal noise is not easily exerted. Thus, the signal component of a required channel can efficiently be extracted.
  • the transmission unit 40 incorporates the marking-signal generator 31 and the adder 29.
  • the marking signal synchronized with any one of the information signal D1, the spreading code SC1 or the spread signal SS1 is added to the spread signal SS1 by the adder 29 so as to be transmitted to the electricline. Therefore, the receiving unit 80 does not require the synchronization capturing method using detection of the correlation value. That is, the marking signal is extracted from the signal received from the electric line so that easy capturing of the synchronization in accordance with the timing of the marking signal supplied in the predetermined period is permitted. That is, any special circuit having a relatively large circuit size for detecting the predetermined correlation value is not required. Therefore, synchronization can be established by a relatively simple circuit (for example, the filter circuit) arranged to detect the timing of the marking signal. Hence it follows that an effect can be obtained in that the wired spread spectrum communication can be realized with a relatively simple structure.
  • the system shown in Fig. 8 is an example of a system bus of a computer incorporating the transmission unit 20 and the receiving unit 50. That is, data in the form of parallel signals which is, through the system bus, communicated among the calculating unit (an MPU), a storage unit (RAM and ROM), an input/output unit (I/O) and a peripheral unit (PE) is multiplexed as data in the form of the information signals D1 to Dn for each channel.
  • the system buses for establishing the connection among the MPU and the RAM are unified.
  • the computer Since the information society has come realized by the Internet which is a core system, the computer also serves as an important portable information terminal. Although reduction in the size and weight of the computer are considerably required, the presence of the system bus constituted by the plural signal lines inhibits the size reduction of the computer.
  • the system bus is exemplified by the wiring pattern among function blocks in a semiconductor integrated circuit, the printed circuits for establishing the connections between the MPU and the RAM and between the MPU and the ROM formed on a system bus and cables for establishing the connections between the main substrate, on which the foregoing units are mounted, and the I/O and between the main substrate and the PE (a secondary strength unit, a communication control unit or the like).
  • a structure as shown in Fig. 8 is employed in which the transmission unit 20 and the receiving unit 50 are interposed among the MPU, the RAM, the ROM, the I/O and the PE.
  • the system buses SB for establishing the foregoing units can be unified so that the foregoing problem is overcome.
  • a structure as shown in Fig. 8 is employed in which the transmission unit 20 is disposed between the MPU and the system bus SB. Moreover, the receiving unit 50 is disposed between the system bus SB and each of the RAM, ROM, I/O and the PE.
  • the transmission unit 20 incorporates the spread-signal generators 1 to n corresponding to the number (n) of the signal lines which are outputs from the MPU.
  • the transmission unit 20 multiplexes data (information signals D1 to Dn) transmitted from the MPU and formed into an n-bit structure by a CDMA using spread signals assigned to each RAM, ROM, I/O and the PE, respectively so as to transmit the multiplexed signals to the system bus SB.
  • the receiving unit 50 disposed between the system bus SB and each unit, that is, the RAM, the ROM, the I/O and the system bus SB incorporates inverse-diffusion decoders 1 to n which correspond to the number (n) of the signal lines which are output to the RAM and the like.
  • serial data multiplexed by the CDMA and supplied from the system bus SB is inversely spread with the spreading codes assigned to the RAM, the ROM, the I/O and the PE so that the signal is separated.
  • the information signals D1' and Dn' for each bit are decoded so as to be transmitted to the RAM, the ROM and the like.
  • the inverse-diffusion decoder 1 is a concept incorporating the spreading-code generator 53, the multiplier 56, the integrator 61 and the comparator 65.
  • the inverse-diffusion decoder 2 is a concept incorporating the spreading-code generator 54, the multiplier 57, the integrator 62 and the comparator 66.
  • the inverse-diffusion decoder n is a concept incorporating the spreading-code generator 55, the multiplier 58, the integrator 63 and the comparator 67 (see Fig. 1).
  • the transmission unit 20 is disposed between the MPU and the system bus SB and the receiving unit 50 is disposed between the system bus SB and each of the RAM, the ROM, the I/O and the PE.
  • the parallel data transmitted from the MPU and formed into the n-bit structure can be transmitted to one system bus SB as serial data.
  • serial data supplied from the system bus SB can be restored to the parallel data formed into the n-bit structure so as to be communicated to the RAM, the ROM and the like.
  • a unified system bus can be realized.
  • the area required to wire or lay the system buses in the semiconductor integrated circuit, on the surface of the substrate or in the apparatus can considerably be reduced. Therefore, an effect can be obtained in that the size and weight of the computer can be reduced.
  • the transmission unit 20 is disposed between the MPU and the system bus SB and the receiving unit 50 is disposed between the system bus SB and each of the RAM, the ROM, the I/O and the PE.
  • the positions are not limited to the foregoing positions.
  • the receiving unit 50 may be disposed between the MPU and the system bus SB.
  • the transmission unit 20 may be disposed between the system bus SB and each of the RAM, the ROM, the I/O and the PE.
  • the system buses can be unified when data is transmitted from the RAM, the ROM, the I/O or the PE to the MPU.
  • a transmitting/receiving unit 100 formed by integrating the transmission unit 20 and the receiving unit 50 may be disposed between the system bus SB and each of the MPU, the RAM, the ROM, the I/O and the PE.
  • the transmitting/receiving unit 100 incorporates a selector 110 for switching the input of the parallel signal to the transmission unit 20 and the output of the parallel signal from the receiving unit 50.
  • the parallel signal line can commonly be used.
  • FIG. 10 (A) An example of the system shown in Fig. 10 (A) is structured such that a serial-parallel converter is constituted by using the transmission unit 20. Moreover, the parallel-serial converter is constituted by the receiving unit 50.
  • the serial transmission requires at least transmission time which is n-times long.
  • the reason for this lies in that the transmission side sequentially stores the parallel signals into the serial buffer 902 and the receiving side waits for a moment of time at which all of the data items are obtained.
  • the transmission unit 20 is employed as a substitute for the parallel-serial converter 901 and the serial buffer 902.
  • the receiving unit 50 is employed as a substitute for the serial-parallel converter 911 and the serial buffer 912.
  • the transmission unit 20 incorporates the spread-signal generators by the number corresponding to the number (n) of the signal lines which are parallel inputs.
  • the parallel data (the information signals D1 to Dn) formed into the n-bit structure is multiplexed by CDMA so as to transmit the multiplexed data to the serial signal line SL.
  • parallel data in the form of the n-bit structure can be processed by a parallel signal process to transmit the processed data to the serial signal line SL as serial data.
  • the spread-signal generator is a concept incorporating the foregoing spreading-code generator and the multiplier.
  • the transmission unit 20 is employed as a substitute for the parallel-serial converter 901 and the serial buffer 902.
  • the receiving unit 50 is employed as a substitute for the serial-parallel converter 911 and the serial buffer 912.
  • parallel signal processes are performed to realize the parallel-serial conversion and the serial-parallel conversion.
  • a necessity for waiting for a predetermined time can be eliminated as distinct from the conventional parallel-serial converter 901 and the serial-parallel converter 911.
  • the parallel-serial conversion and the serial-parallel conversion can sequentially be performed. Hence it follows that an effect can be obtained in that high-speed data conversion can be realized between parallel data and serial data.
  • Fig. 11 shows an example of the system which is a control line for a large-scale unit (for example, a display unit for a Ferris wheel) incorporating the transmission unit 20 and the receiving unit 50.
  • a large-scale unit for example, a display unit for a Ferris wheel
  • a control signal transmitted from the control unit 601 is multiplexed by the CDMA using the spreading codes assigned to the display units 511 to 516 to transmit the multiplexed signal to one serial signal line SL.
  • the display units 511 to 516 receive the multiplexed control signals received from the serial signal line SL to inversely spread the control signals with the spreading codes assigned to the display units 511 to 516 to separate the signals.
  • the display units 511 to 516 are able to decode only the corresponding control signals with the corresponding spreading codes. Therefore, the display units 511 to 516 decode only the corresponding control signals transmitted to the display units 511 to 516 so as to be controlled in a predetermined manner.
  • the serial signal lines SL for establishing the connections among the control unit 601 and the display units 511 to 516 can be realized by one electric line. Hence it follows that the costs of the facilities and maintenance of the electric lines can be reduced.
  • the aspect of the invention incorporates the spreading-code generator, the multiplier, the integrator and the comparator. Therefore, the signals received from the transmission line are multiplied with the inversely-spreading codes so as to be formed into the inversely-spread signals. Then, at least one period of the bit region of each bit of the information signal is integrated. Then, whether or not the integrated value is larger than the predetermined value is determined by making a comparison. Thus, decoding to the information signals is performed. At least one period of the inversely-spread signal is integrated for each bit of the information signal so as to extract the information signals from the inversely-spread signals. Therefore, an effect can be realized in that spread spectrum communication can be realized with a relatively simple structure. Since Gaussian noise or the like is removed by smoothing the waveform by performing integration, an influence of signal noise is not easily exerted. As a result, an effect can be obtained in that signal components of a required channel can efficiently be extracted.
  • the aspect of the invention has the step of multiplying the information signal and the spreading code to generate a spread signal. Then, the spread signal is transmitted to the transmission line. That is, the information signal is directly spread to transmit the spread signal to the transmission line. Therefore, the method of modulating the information signal by PSK or the like before diffusion is performed is not employed as distinct from the wireless spread spectrum method. Thus, any primary modulation circuit is not required. As a result, an effect can be obtained in that spread spectrum communication can be realized with a relatively simple structure.
  • the aspect of the invention has the steps of multiplying a signal received from the transmission line with a predetermined spreading code to generate an inversely-spread signal; integrating the inversely-spread signal in a quantity of at least one period of the information signal constituted by one bit of the information signal; and making a determination whether or not the integrated value is larger than a predetermined value so that the information signal for each channel is decoded. That is, the generated inversely-spread signal is integrated in a quantity of at least one period constituted by one bit of the information signal to extract the information signal from the inversely-spread signal. Therefore, an effect can be obtained in that the spread spectrum method can be realized with a relatively simple structure. Since Gaussian noise or the like is removed by smoothing the waveform by performing integration, an influence of signal noise is not easily exerted. As a result, an effect can be obtained in that signal components of a required channel can efficiently be extracted.
  • the aspect of the invention has the step of transmitting the synchronized signal synchronized with anyone of, the information signal, the spreading code and the spread signal to the transmission line together with the spread signal. That is, also the synchronized signal which is effective for the receiving side to reproduce the signal is transmitted to the transmission line together with the spread signal. Therefore, the synchronization capturing method using detection of the correlation value is not employed by the receiving side to extract the synchronized signal from the signal received from the transmission line. Therefore, an effect can be obtained in that spread spectrum communication can be realized with a relatively simple structure.
  • an effect can be obtained in that a wired CDMA can be realized with a relatively simple structure. Since Gaussian noise or the like is removed by smoothing the waveform by performing integration, an influence of signal noise is not easily exerted. Moreover, signal components of the other channels can be removed. As a result, an effect can be obtained in that signal components of a required channel can efficiently be extracted.
  • the aspect of the invention has the step of multiplying each information signal for each of the plural channels with a corresponding spreading code to generate a spread signal. Then, the spread signals are added and transmitted to the transmission line. That is, the information signals of a plurality of the channels are directly spread and added so as to be transmitted to the transmission line. Therefore, the method of spreading the information signals of the plural channels after the multi-valued modulation has been performed is not employed as distinct from the CDMA for the wireless communication. As a result, the modulation circuit for the multi-valued modulation is not required. Thus, an effect can be obtained in that a wired CDMA can be realized with a relatively simple structure.
  • Gaussian noise or the like is removed by smoothing the waveform by performing integration, an influence of signal noise is not easily exerted. Moreover, signal components of the other channels can be removed. As a result, an effect can be obtained in that signal components of a required channel can efficiently be extracted.
  • the aspect of the invention incorporates the synchronizing-signal generator and the transmission means. Therefore, the synchronized signal synchronized with any one of the information signal, the spreading code and the spread signal is transmitted to the transmission line together with the spread signal. Also the synchronized signal which is effective for the receiving side to reproduce the signal is transmitted to the transmission line together with the spread signal. Therefore, the synchronization capturing method using detection of the correlation value is not employed by the receiving side to extract the synchronized signal from the signal received from the transmission line. Therefore, an effect can be obtained in that s CDMA can be realized with a relatively simple structure.
  • the synchronization can be captured by a method of extracting the marking signal from the signal received from the transmission line, an effect can be obtained in that a CDMA which is capable of quickly capturing the synchronization as compared with the synchronization capturing method using detection of the correlation value can be realized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
EP20000107077 1999-08-27 2000-04-05 Appareil pour communication filaire à spectre etalé et procédé de communication Withdrawn EP1079536A2 (fr)

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JP24091899 1999-08-27
JP24091899 1999-08-27
JP2000030116 2000-02-08
JP2000030116A JP2001144653A (ja) 1999-08-27 2000-02-08 有線スペクトラム拡散通信装置および通信方法

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